Dynamic electrical properties of polymer-carbon nanotube composites: Enhancement through covalent bonding

被引：0

作者：

Curran S.A. ^{[1
]}

Zhang D. ^{[1
]}

Wondmagegn W.T. ^{[1
]}

Ellis A.V. ^{[2
]}

Cech J. ^{[3
]}

Roth S. ^{[3
]}

Carroll D.L. ^{[4
]}

机构：

[1] New Mexico State University, Department of Physics, Las Cruces

[2] Gracefield Research Centre, Industrial Research Ltd.

[3] Max Planck Institute for Solid State Research

[4] Department of Physics, Wake Forest University, Winston-Salem

来源：

Journal of Materials Research | 2006年 / 21卷 / 4期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1557/jmr.2006.0129

中图分类号：

学科分类号：

摘要：

Composite formation between carbon nanotubes and polymers can dramatically enhance the electrical and thermal properties of the combined materials. We have prepared a composite from polystyrene and multi-walled carbon nanotubes (MWCNT) and, unlike traditional techniques of composite formation, we chose to polymerize styrene from the surface of dithiocarboxylic ester-functionalized MWCNNs to fabricate a unique composite material, a new technique dubbed "gRAFT" polymerization. The thermal stability of the polymer matrix in the covalently linked MWCNT-polystyrene composite is significantly enhanced, as demonstrated by a 15 °C increase of the decomposition temperature than that of the noncovalently linked MWCNT-polystyrene blend. Thin films made from the composite with low MWCNT loadings (<0.9 wt%) are optically transparent, and we see no evidence of aggregation of nanotubes in the thin film or solution. The result from the conductivity measurement as a function of MWCNT loadings suggests two charge transport mechanisms: charge hopping in low MWCNT loadings (0.02-0.6 wt%) and ballistic quantum conduction in high loadings (0.6-0.9 wt%). The composite exhibits dramatically enhanced conductivity up to 33 S m-1 at a low MWCNT loading (0.9 wt%). © 2006 Materials Research Society.

引用

页码：1071 / 1077

页数：6

共 52 条

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